关于数据项uid的一个要点—它们并不总是保持不变。
One important thing to note about data item uids-they don't always stay the same.
频道中的其他元素可能不变，但项经常发生变化。
While other elements within a channel may stay constant, items are likely to change frequently.
频道中的其他元素可能不变，但项经常发生变化。
While other elements within a channel may stay constant, items are likely to change frequently.
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